Feed grinder



Oct. 17, 1933. I L. c. PETERSON 1,930,523

FEED GRINDER Filed Jan. 20, 1930 2 Slxeecs-Sheet;` 2

gnwntoz L L 0 v0 C. PErEKQ/s/ Patented Oct. 17, 1933 UNITED STA FEED GRINDER Lloyd C. Peterson, Mount Pleasant, Iowa Application January 20,

1 Claim.

This invention appertains to Crushers and grinders and more particularly to a feed mill for grinding oats, corn, rye, small grain of all kinds, fodder, hay and roughage and like material.

One of the primary objects of my invention is to provide a feed grinder having novel power driven circular cutting blades for coaction with a circular screen, the neness of the material being cut depending upon the size of the screen used.

A further important object of my invention is the provision of a semi-circular lower screen for coaction with the cutting blades and an upper screen for coaction with the blades carried by the cover of the mill directly in advance of the feed hopper or trough, so that the material to be ground will be acted upon immediately upon the entrance thereof to the mill so that the material will be materially reduced in size by the time the same reaches the lower screen, thereby permitting the mill to efciently handle a large quantity of material in an efcient manner.

A further object of my invention is the provision of novel means for arranging the lower semi-cylindrical screen within the body of the mill whereby the same can be quickly and easily removed, when it is desired to repair or replace the same, or to change the size thereof.

A further object of my invention is the provision of novel means for associating the hopper or feed trough with the pivoted cover of the body and novel means for adjustably holding the hopper or feed trough in place.

A further important object of my invention is the provision of novel means for constructing the circular cutting blade, each of the circular cutting blades embodying peripheral teeth arranged in lsets, the teeth of each set being staggeredly arranged relative to one another and the sets of teeth being projected laterally from opposite sides of the blades.

A still further object of my invention is to provide a novel feed grinding mill of the above character, which will be durable and eflicient in use, one that will be simple and easy to manufacture, and one which can be placed upon the market as a reasonable cost.

With these and other objects in view, the invention consists in the novel construction, arrangement and formation of parts, as will be hereinafter more specifically described, claimed, and illustrated in the accompanying drawings in which drawingszv Figure 1 is a side elevation of my improved mill.

Figure 2 is a rear elevation of the same.

1930. Serial No. 422,199

(Cl. S2W-11) Figure 3 is a longitudinal vertical section taken through the mill on the line .3-3 ofv Figure 2 looking in the direction of theA arrows illustrating the novel arrangement of the upper and lower screens and the hopper or feed trough carried by the pivoted cover.

Figure 4 is a horizontal section through the improved mill taken on the line 4-4 of Figure 3 looking in the direction of the arrows.

Figure 5 is a vertical transverse section taken on the line 5-5 of Figure 3 looking in the direction of the arrows.

Figuren is a fragmentary vertical section taken at right angles to Figure 5 showing the cover swung back to its open positionrandthe bottom screen partially removed.

Figure 7 is a fragmentary side elevation of one ofthe cutting blades, and

Figure 8 is a fragmentary detail perspective View of 'one of the cutting blades showing the novel arrangement of the cutting teeth.

Referring to the drawings in detail, wherein similar reference characters designate corresponding parts throughout the several views, the letter A generally indicates my improved feed grinder which comprises a body 10 having a pivoted cover 20 of substantially semi-circular form. The body 10 includes vertical side walls 11 and 12 and end Walls 13, and 14. These walls 11, l2, 13, and 14 can be formed from boiler iron suit- 'ably bolted and riveted together with angle iron corner standards 15. The lower edges of the side walls 11 and 12 may have bolted, or riveted thereto angle iron side rails 16 which can form a suitable base. n

The cover 20 embodies substantially semi-circular shaped side walls 21 which are connected together by a top arcuate wall 22 embodying sections 23 and'24 scribed on different arcs of a circle to dene a centrally disposed feed opening 25. The side walls 21 are connected-with the sections ofthe top wall by means of angle `iron braces or straps 26. The entrance opening 25 extends transversely of the top and receives the inner end of the hopper or feed trough 27 and as shown this end of the trough is connected to the side walls 21 of the cover by means of pivot pins 28. The lower face of the hopper or feed trough 27 adjacent to its outer end is provided with a rack bar 2li, between any selected teeth of which is adapted to be received the bight portion of the holding bail 30. The lower ends of the legs of the bail 30 are extended at right angles to provide feet 31, which form the pivots or pintles for the hinges 32 which unite the cover to the end wall 13 of the body 10. Thus the holding bail of the trough acts as the hinge pin for the cover and the bail can be swung on the hinge leaves for adjustably holding the feed trough -27 in the desired adjusted position.

The side walls 11 and 12 of the body l0 adjacent to their upper end support bearing brackets 33 for the bearings 34 of the operating shaft 35. These bearings 34 can be of the roller or ball bearing type. The shaft extends across the body and can be driven from any suitable source of power, one end of the same being provided with a drive pulley 36 for this purpose.

The operating shaft 35 supports a plurality of equi-distantly spaced cutting discs 37 and as shown, the shaft extends through the axis of the discs and the discs are held in their spaced relation by means of balanced cast iron washers 38.

The cutting discs 37 are of novel construction and the periphery of each disc is provided with sets of cutting teeth 39 and the sets of teeth 39 are bent at an incline alternately from the opposite sides of the blade. It is to be noted that the teeth of each set are arranged in stepped relation relative to one another, that is, each extends at a greater angle than the other from the discs or bodies of the blade.

In connection with the cutting blades 37, I provide a substantially semi-cylindrical cutter or grater screen 40, which is held in position by means of semi-circular angle bars 41 riveted or otherwise secured to the inner faces of the side walls 11 and Y12 of the body 10. By this arrangement the screen 40 can be readilyremoved from the body, as shown in Figure 6 of the drawings, so as to permit repairs to be made thereto or to permit the screen to be renewed or replaced by screens having finer or larger openings, as may be desired. If preferred, the screen 40 can be removably held in position on the angle bars 41 against accidental displacement by removable bolts (not shown).

For cooperation with the blades 37, I also provide an upper screen 42, which forms an important part of my invention. This upper screen 42 is carried by the section 24 of the cover 22 and is scribed on a Ydifferent arc of a circle from said section 24, and extends from the inner face of the cover adjacent to the feed opening 25 in spaced relation thereto down to the lower edge of the cover for abutting engagement with the upper edge of the lower screen 40 at one end thereof.

An imperforate guard plate 43 is carried by the other section 23 of the cover 22 and extends from the upper end of this section directly below the feed opening 25 in spaced relation thereto and adapted to engage the oppositer end of the lower screen 40 from the end engaged by the upper screen 42 when the cover 20 is in its lowered position. `As shown, this guard plate'43 is scribed on a different arc of a circle from the section 23 of the cover.

In operation of my improved device, the shaft 35 is driven at the desired rate of speed in any preferred way and the feed trough 27 is set at the desired angle. The material to be ground is placed on the feed trough and forced through the feed opening 25 where the same will be received between the upper screen 42 and the cutting knives 37. As soon as the material is fed into the mill the knives and the screen 42 will immediately act thereon and the material will be reduced to a limited extent before its movement between the cutting knives 37 and the lower screen 40 permitting the effective operation of the knives and screens thereon. Thus a larger volume of material is permitted to be handled in a less space of time. It has been found that mills have a tendency to clog when effort is made to increase the capacity thereof and by arranging the upper screen 42 in the predetermined relation as shown and described, I have found that the mill is less likely to clog and will more efficiently handle the material.

Changes in details may be made without departing from the spirit or the scope of this in vention, butz- What I claim as new is:

In a mill, a body having a cover provided with a pair of sections curved inward toward the upper ends thereof and having adjacent ends at the top of the cover and arranged in superposed spaced relation to define a lateral transversely extending opening, one of the sections being hinged, a shaft extending transversely of the body and having a plurality of cutter discs, a lower semi-cylindrical screen carried by the body below the cutter discs and concentric therewith and arranged in close relation with respect to the edge of the cutter discs, an upper screen of arcuate form resting at the lower end thereof on said lower screen in spaced relation to said discs and receding toward the upper end thereof from said cutter discs thereby increasing the space between the cutter discs and the upper end of the upper screen for the reception of material to cause material to lie gradually crowded and drawn down between the cutter discs and said upper screen, the upper terminal portion of said uppe. screen being positioned immediately in advance of said lateral opening and engaging one of the sections of said cover, an arcuate guard opposite said upper screen and resting on the lower screen and having the upper terminal portion thereof engaged with one of said sections immediately below said opening, and a feed member extending through said opening and resting on the upper terminal portion of that cover section which forms the lower side of said opening.

LLOYD C. PETERSON. 

